A quick note for anyone in Europe needing a caliper rebuild kit (new piston, seals etc) for their GT: they are still available from Crooks Suzuki in the UK and not expensive.
No need to gamble on eBay just yet
1976 GT380 - wounded by me, and sold on
2006 SV650S - killed by a patch of diesel and a kerb in Feb 2019
2017 SV650 AL7 - naked and unashamed